In small saucepan, heat sugar and butter over medium heat, stirring constantly. When butter is melted, add maple syrup and heavy cream. Stir in over heat until completely mixed. Pour this mixture into loaf pan, covering bottom completely. Add cinnamon buns over the liquid mixture. Bake at 400° for 8-10 minutes or until buns are cooked completely. Place serving plate upside down over pan and immediately turn the plate and pan over. Let pan remain upside down for about a minute so maple mixture can drizzle over the sticky buns. Remove pan and serve warm.